Реакция ионного обмена

1) AgNO₃+H₃PO₄=

2) Pb (NO₃) ₂+H₂S=

3) Al₂ (SO₄) ₃+KOH=

1) 3AgNO₃ + H₃PO₄ = Ag₃PO₄↓ + 3HNO₃;

3Ag⁺ + 3NO₃⁻ + 3H⁺ + PO₄³⁻ = Ag₃PO₄↓ + 3H⁺ + 3NO₃⁻;

3Ag⁺ + PO₄³⁻ = Ag₃PO₄↓.

2) Pb (NO₃) ₂ + H₂S = PbS↓ + 2HNO₃;

Pb⁺² + 2NO₃⁻ + 2H⁺ + S²⁻ = PbS↓ + 2H⁺ + 2NO₃⁻;

Pb⁺² + S²⁻ = PbS↓.

3) Al₂ (SO₄) ₃ + 6KOH = 2Al (OH) ₃↓ + 3K₂SO₄;

2Al⁺³ + 3SO₄²⁻ + 6K⁺ + 6OH⁻ = 2Al (OH) ₃↓ + 6K⁺ + 3SO₄²⁻;

2Al⁺³ + 6OH⁻ = 2Al (OH) ₃↓;

Al⁺³ + 3OH⁻ = Al (OH) ₃↓.